BIO_s_accept(3) OpenSSL BIO_s_accept(3)NAME
BIO_s_accept, BIO_set_accept_port, BIO_get_accept_port, BIO_set_nbio_accept,
BIO_set_accept_bios, BIO_set_bind_mode, BIO_get_bind_mode, BIO_do_accept - accept BIO
SYNOPSIS
#include <openssl/bio.h>
BIO_METHOD *BIO_s_accept(void);
long BIO_set_accept_port(BIO *b, char *name);
char *BIO_get_accept_port(BIO *b);
BIO *BIO_new_accept(char *host_port);
long BIO_set_nbio_accept(BIO *b, int n);
long BIO_set_accept_bios(BIO *b, char *bio);
long BIO_set_bind_mode(BIO *b, long mode);
long BIO_get_bind_mode(BIO *b, long dummy);
#define BIO_BIND_NORMAL 0
#define BIO_BIND_REUSEADDR_IF_UNUSED 1
#define BIO_BIND_REUSEADDR 2
int BIO_do_accept(BIO *b);
DESCRIPTION
BIO_s_accept() returns the accept BIO method. This is a wrapper round the platform's
TCP/IP socket accept routines.
Using accept BIOs, TCP/IP connections can be accepted and data transferred using only BIO
routines. In this way any platform specific operations are hidden by the BIO abstraction.
Read and write operations on an accept BIO will perform I/O on the underlying connection.
If no connection is established and the port (see below) is set up properly then the BIO
waits for an incoming connection.
Accept BIOs support BIO_puts() but not BIO_gets().
If the close flag is set on an accept BIO then any active connection on that chain is
shutdown and the socket closed when the BIO is freed.
Calling BIO_reset() on a accept BIO will close any active connection and reset the BIO
into a state where it awaits another incoming connection.
BIO_get_fd() and BIO_set_fd() can be called to retrieve or set the accept socket. See
BIO_s_fd(3)
BIO_set_accept_port() uses the string name to set the accept port. The port is represented
as a string of the form "host:port", where "host" is the interface to use and "port" is
the port. Either or both values can be "*" which is interpreted as meaning any interface
or port respectively. "port" has the same syntax as the port specified in
BIO_set_conn_port() for connect BIOs, that is it can be a numerical port string or a
string to lookup using getservbyname() and a string table.
BIO_new_accept() combines BIO_new() and BIO_set_accept_port() into a single call: that is
it creates a new accept BIO with port host_port.
BIO_set_nbio_accept() sets the accept socket to blocking mode (the default) if n is 0 or
non blocking mode if n is 1.
BIO_set_accept_bios() can be used to set a chain of BIOs which will be duplicated and
prepended to the chain when an incoming connection is received. This is useful if, for
example, a buffering or SSL BIO is required for each connection. The chain of BIOs must
not be freed after this call, they will be automatically freed when the accept BIO is
freed.
BIO_set_bind_mode() and BIO_get_bind_mode() set and retrieve the current bind mode. If
BIO_BIND_NORMAL (the default) is set then another socket cannot be bound to the same port.
If BIO_BIND_REUSEADDR is set then other sockets can bind to the same port. If
BIO_BIND_REUSEADDR_IF_UNUSED is set then and attempt is first made to use BIO_BIN_NORMAL,
if this fails and the port is not in use then a second attempt is made using
BIO_BIND_REUSEADDR.
BIO_do_accept() serves two functions. When it is first called, after the accept BIO has
been setup, it will attempt to create the accept socket and bind an address to it. Second
and subsequent calls to BIO_do_accept() will await an incoming connection, or request a
retry in non blocking mode.
NOTES
When an accept BIO is at the end of a chain it will await an incoming connection before
processing I/O calls. When an accept BIO is not at then end of a chain it passes I/O calls
to the next BIO in the chain.
When a connection is established a new socket BIO is created for the connection and
appended to the chain. That is the chain is now accept->socket. This effectively means
that attempting I/O on an initial accept socket will await an incoming connection then
perform I/O on it.
If any additional BIOs have been set using BIO_set_accept_bios() then they are placed
between the socket and the accept BIO, that is the chain will be
accept->otherbios->socket.
If a server wishes to process multiple connections (as is normally the case) then the
accept BIO must be made available for further incoming connections. This can be done by
waiting for a connection and then calling:
connection = BIO_pop(accept);
After this call connection will contain a BIO for the recently established connection and
accept will now be a single BIO again which can be used to await further incoming
connections. If no further connections will be accepted the accept can be freed using
BIO_free().
If only a single connection will be processed it is possible to perform I/O using the
accept BIO itself. This is often undesirable however because the accept BIO will still
accept additional incoming connections. This can be resolved by using BIO_pop() (see
above) and freeing up the accept BIO after the initial connection.
If the underlying accept socket is non-blocking and BIO_do_accept() is called to await an
incoming connection it is possible for BIO_should_io_special() with the reason
BIO_RR_ACCEPT. If this happens then it is an indication that an accept attempt would
block: the application should take appropriate action to wait until the underlying socket
has accepted a connection and retry the call.
BIO_set_accept_port(), BIO_get_accept_port(), BIO_set_nbio_accept(),
BIO_set_accept_bios(), BIO_set_bind_mode(), BIO_get_bind_mode() and BIO_do_accept() are
macros.
RETURN VALUES
TBA
EXAMPLE
This example accepts two connections on port 4444, sends messages down each and finally
closes both down.
BIO *abio, *cbio, *cbio2;
ERR_load_crypto_strings();
abio = BIO_new_accept("4444");
/* First call to BIO_accept() sets up accept BIO */
if(BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error setting up accept\n");
ERR_print_errors_fp(stderr);
exit(0);
}
/* Wait for incoming connection */
if(BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error accepting connection\n");
ERR_print_errors_fp(stderr);
exit(0);
}
fprintf(stderr, "Connection 1 established\n");
/* Retrieve BIO for connection */
cbio = BIO_pop(abio);
BIO_puts(cbio, "Connection 1: Sending out Data on initial connection\n");
fprintf(stderr, "Sent out data on connection 1\n");
/* Wait for another connection */
if(BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error accepting connection\n");
ERR_print_errors_fp(stderr);
exit(0);
}
fprintf(stderr, "Connection 2 established\n");
/* Close accept BIO to refuse further connections */
cbio2 = BIO_pop(abio);
BIO_free(abio);
BIO_puts(cbio2, "Connection 2: Sending out Data on second\n");
fprintf(stderr, "Sent out data on connection 2\n");
BIO_puts(cbio, "Connection 1: Second connection established\n");
/* Close the two established connections */
BIO_free(cbio);
BIO_free(cbio2);
SEE ALSO
TBA
1.0.1e 2013-02-11 BIO_s_accept(3)